To get a number to decrease by 21% you multiply it by 0.79 (1-0.21)
r = 0.79
Answer:
3/7 =12/n
3n=7×12
3n=84
n=84÷3
n=28
3/7= t/21
3×21=7t
63=7t
t=63÷7
t=9
3/7 =k-1/2k+10
3(2k+10)=7(k-1)
6k+30=7k-7
k=37
Step-by-step explanation:
Set an equation:
Let x=the total amount of extra money
120+30•12+x=900
120+360+x=900
480+x=900 Subtract 480 from both sides.
x=420
Now divide by 12 to find the amount for each month
Answer: Shaniqua needs to save $35 extra per month.
Answer:
x=33
Step-by-step explanation:

multiply 2 by both sides
x-3=30
add 3 to both sides
x=33
Answer:
41
Step-by-step explanation:
1. Look at the first digit and ask yourself: is this divisible by 8? (3 is not so you look at the next one)
2. 8 goes into 32 evenly 4 times (put 4 at the top)
3. Subtract 42
4. Drag down the 8
5. Does 8 go into 8? (Yes!)
6. Put one at the top and subtract to get zero
7. Answer is at the top: 41